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Geology and Mining Activities IV-l IV GEOLOGY AND MINING ACTIVITIES 1. GEOLOGY All of the Youghiogheny Basin lies within the Applachian Plateaus Province. Some 30%, west of Chestnut Ridge, is in the Pittsburgh Plateaus Section of the province and the rest is in the Allegheny Mountain Section. A series of folds creates ridges and valleys which generally trend SW to NE. Folds east of Chestnut Ridge are closer and more uniform. West of Chestnut Ridge is more mountainous and includes Mt. Davis formed by the Negro Mountain Anticline, and which is the highest point in Pennsylvania, elev 3,213 ft. Prominent structural features are shown in Figure 1. Those of particular importance to mine drainage pollution are, from west to east: Important Important Structure Strata Group Coal Pigeon Creek Syncline Monongahela Pittsburgh Irwin Syncline Monongahela Pittsburgh Greensburg Syncline Monongahela Pittsburgh Latrobe Syncline Monongahela Pittsburgh Uniontown Syncline Monongahela Pittsburgh Ligonier Syncline Allegheny L. Kittanning Centerville Dome Allegheny L. Freeport Negro Mt. Anticline Allegheny L. Kittanning & Brookville Berlin Syncline Monongahela Pittsburgh & Allegheny L. Kittanning & U. Kittanning These geologic structures are discussed starting on page IV-4. A generalized tabulation of the stratigraphy is included in Table IV-A. The Washington Group is not included since this has been eroded away except on a few hilltops in the deepest syncline basins. IV-2 Table IV-A, Geologic Strata Age Group Thickness Members Thickness Pennsylvanian Monongahela 260-400’ Waynesburg Coal 3 -9’ Waynesburg Limestone 0-20’ Uniontown Sandstone 10-20’ Uniontown Coal 0 -2’ Uniontown Limestone 25-45’ Benwood Limestone 30-60’ Sewickley Sandstone 0-60’ SEWICKLEY COAL* 0-10’ Fishpot Limestone 5-30’ REDSTONE COAL* 1 -5’ Redstone Limestone 5-20’ Pittsburgh Sandstone 12-70’ PITTSBURGH COAL** 6 -14’ Pennsylvanian Conemaugh 500-750’ Little Pittsburgh Coal 0-l Connellsville Sandstone 5 -50’ Clarksburg Limestone 0 -7’ Morgantown Sandstone 5 -120’ Birmingham Shale 50 -60’ L. Bakerstown Coal 0 -7’ Saltsburg Sandstone 20 -85’ Buffalo Sandstone 20 -60’ Brush Creek Coal 0 -5’ Mahoning Coal Thin Mahoning Sandstone 20 -120’ Pennsylvanian Allegheny 250-370’ UPPER FREEPORT COAL* 1 -15’ Butle Sandstone 10 -50’ LOWER FREEPORT COAL* 0 -4’ Freeport Sandstone 30 -60’ UPPER KITTANNING COAL* 0 -13’ Worthington Sandstone 10 -70’ Middle Kittanning Coal 0 -2’ LOWER KITTANNING COAL* 0 -4’ Kittanning Sandstone 10 -50’ CLARION COAL* 0 -6’ Clarion Sandstone 5 -50’ BROOKVILLE COAL* 0 -6’ Pennsylvanian Pottsville 65-250’ Homewood Sandstone 15-70’ Mercer Shale&Coal 1-50’ Connoquenessing Sandstone 10 -80’ Mississippian Mauch Chunk 0-310’ Wymps Gap Limestone 0 -110’ Loyalhanna Limestone 20 -60’ *Extensively mined **Most extensively mined IV-4 A. Geologic Structures West of Chestnut Ridge Five syncline basins west of Chestnut Ridge involve major mine drainage pollution problems: -Pigeon Creek Syncline basin, at the SE corner of Allegheny County, extends to several watersheds including a sub-basin of the Monongahela River as well as the Gillespie Run sub-basin of the Youghiogheny. -Irwin (Port Royal) Syncline basin, in the southwest part of Westmoreland County, extends to many sub-basins of the Sewick1ey Creek watershed and several small sub- basins of the Youghiogheny main-stem watershed. -Greensburg Syncline basin, at the Greensburg area of Westmoreland County, extends to the Jacks Run watershed of Sewick1ey Creek and to the Crabtree Creek watershed of the Allegheny River basin. -Latrobe Syncline basin, through the middle of Westmore- land County, extends to the Jacobs Creek and Sewick1ey Creek areas of the Youghiogheny and to the Loya1hanna basin of the Allegheny -Uniontown Syncline basin, through the middle of Fayette County, extends to a number of surface watersheds including Galley and Hickman Runs of the Youghiogheny, and Redstone Creek of the Monongahela watershed. (1) Pigeon Creek Syncline Basin Pigeon Creek Syncline Basin, Figure 2, is in Allegheny County between the Youghiogheny and Monongahela Rivers. The uppermost strata are entirely Monongahela group and the Pittsburgh coal outcrop encompasses some 30 sq mi. Throughout the syncline basin, the coal seam is relatively flat with low points at; discharges M77 and M02 on the Youghiogheny side and, on the Monongahela side at the syncline axis. Of many abandoned mines in the basin, Ocean Mine # 2 and the Warden Mine complex are the only ones with polluting discharges to the Youghiogheny. Possible discharges to the Monongahela were not investigated. Discharges (MOl and M02) drain Warden Mine and other mines draining into Warden Mine. Ocean Mine # 2, directly north of Warden, is drained by dis charge (M77) through two brick arch drift openings side by side on the hillside above the Youghiogheny River. All three discharges are from the same coal seam at elevations in very close range (780-800). Character of drainage is shown on Table IV-B. IV-5 Table IV-B, Discharges to the Youghiogheny From Pigeon Creek Syncline Basin Warden Mine Ocean #2 Station MOl M02 M77* Sample 6/69 6/69 5/68 MGD 0.17 1.7 0.8 pH 6.6 6.7 3.7 Mg/l: Acidity 0 0 170 Alkalinity 320 220 0 Iron 11 58 35 Sulfate 244 675 740 Lbs/day: Net acidity -450 -3100 1,200 Iron 15 800 240 *M77 analysis from EPA There are no known surface water sink holes in the area. It is believed that water into the mines is infiltration through cracked walls and ceilings. Also, the discharge from Ocean Mine #2 probably includes drainage from the mined area northwest of Ocean #2. The discharges from Warden Mine are believed overflow from a large pool which collects mine waters from all directions of the syncline basin. Ocean #2 discharge is believed to originate from mines of higher elevation to the northwest since its quality is significantly different from the Warden discharges. Location of the present Warden discharges (MOl and M02), their alkaline quality and the history of pumping during active operation, suggest that these discharges are overflows from a mine water pool which may extend into the Monongahela River watershed. IV-7 (2) Irwin (Port Royal) Syncline Basin Irwin (Port Royal) syncline basin, Figure 3, is in the western part of Westmoreland County. The uppermost strata of the syncline is mostly Monongahela group with scattered small sections of younger Washington group on the top of the Monongahela group. The outcrop line of the Pitts- burgh coal at the base of the Monongahela group encompasses some 150 sq mi. Approximately one -third of the syncline basin surface, north of Irwin, drains into a tributary of the Monongahela River, while the rest drains into Sewickley Creek and the main stem of the Youghiogheny River. Pittsburgh coal in the syncline basin has been mined extensively since the 1860's, and all but two, Hutchinson Mine (M13) and Banning # 4 (M16 and M17), are abandoned. The coal seam is pitched north to south with total drop of 600 feet and slopes up steeply from the syncline axis to the eastern outcrop line. The Youghiogheny River crossing the southern section of the syncline basin has exposed the coal seam below Sewickley Creek. The exposed coal seam near the mouth of Sewickley Creek is the lowest outcrop in the syncline basin, and mine drainages from the syncline basin are mostly in this vicinity. Discharges are listed in Table IV-C. Table IV-C, Mine Drainage From Irwin Syncline Basin Station M03 M04 M13 M14 M16 M17 Sample 6/10/69 6/10/69 6/4/69 6/2/69 6/2/69 6/9/69 MGD 1.6 3.2 4.1 4.5 2.0 2.4 pH 6.1 6.3 5.0 5.4 7.9 5.2 mg /l: acidity 10 10 320 320 0 640 alkalinity 0 128 0 0 100 0 iron 95 38 88 138 2 150 sulfate 1,220 725 1,450 750 930 1,220 lbs/day: net acidity 130 -3200 11,000 12,000 -1700 12,700 iron 1,240 1,000 3,000 5,200 40 3,000 NOTE: M03 -Shaner Mine drainage to Youghiogheny River. M04 -Guffey Mine drainage to Youghiogheny River. M13 -Hutchinson, active mine, discharge to Sewickley Creek. M14 -Keystone, Ocean & Marchand to Sewickley Creek. M16 -Banning Mine # 4, treatment plant discharge to Youghiogheny River. M17 -Banning Mine #4, pump discharge to be treated, to Youghiogheny River. IV-8 All but a small area near West Newton, where there are presently 4 two active operations (Hutchinson Mine and Banning Mine), has been mined out and filled with water. Water flowing into the mined out areas through outcrops and cracks is collected behind barrier pillars and is known to be held much like a large underground lake which overflows into a neighboring mine or an opening depending on a number of factors such as intactness of the barrier pillar, level of the mine water pool, and surface elevation. Water problems at the Hutchinson Mine, the deepest mine in the syncline basin, has been described by E. P. Hall, "Hutchinson Mine - A Problem in Coal Mine Drainage" (Preprints No. 59F309, Society of Mining Engineers of AIME). Hutchinson Mine is surrounded by Magee Mine to the east, Keystone and Ocean Mines to the north and Marchand Mine to the northwest. There is a drainage tunnel through the barrier pillar between Keystone and Ocean Mines to equalize their water levels. After abandonment of these mines, a rock tunnel was driven above coal seam at the barrier pillar between Ocean and Marchand Mines to lower the water level in Ocean. The present discharge (MI4) from Marchand Mine includes the mine waters from Keystone and Ocean Mines. In order to continue the work in the remainder of the active mine, 4 water in Hutchinson Mine is pumped using four 4,200 gpm pumps.
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